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          <th colspan="3" align="center">The Berkeley DB products</th>
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          <td width="20%" align="left"><a accesskey="p" href="intro_where.html">Prev</a> </td>
          <th width="60%" align="center">Chapter 1. 
		Introduction
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    <div class="sect1" lang="en" xml:lang="en">
      <div class="titlepage">
        <div>
          <div>
            <h2 class="title" style="clear: both"><a id="intro_products"></a>The Berkeley DB products</h2>
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      <div class="toc">
        <dl>
          <dt>
            <span class="sect2">
              <a href="intro_products.html#idp50715960">Berkeley DB Data Store</a>
            </span>
          </dt>
          <dt>
            <span class="sect2">
              <a href="intro_products.html#idp50715552">Berkeley DB Concurrent Data Store</a>
            </span>
          </dt>
          <dt>
            <span class="sect2">
              <a href="intro_products.html#idp50708368">Berkeley DB Transactional Data Store</a>
            </span>
          </dt>
          <dt>
            <span class="sect2">
              <a href="intro_products.html#idp50712672">Berkeley DB High Availability</a>
            </span>
          </dt>
        </dl>
      </div>
      <p>
        Oracle provides four Berkeley DB products, each differing by the
        level of database support that they offer.
    </p>
      <div class="itemizedlist">
        <ul type="disc">
          <li>
            Berkeley DB Data Store
        </li>
          <li>
            Berkeley DB Concurrent Data Store
        </li>
          <li>
            Berkeley DB Transactional Data Store
        </li>
          <li>
            Berkeley DB High Availability
        </li>
        </ul>
      </div>
      <p>
        Each product provides additional functionality to the product that
        precedes it in the list.  As a result, you can download Berkeley DB
        and build an application that provides read-only database access
        for a single-user, and later add support for more complex database
        access patterns for multiple users.
   </p>
      <p>
       The single Open Source distribution of Berkeley DB from Oracle
       includes the four products and building the distribution
       automatically builds all four products. However, you must use the
       same Berkeley DB product throughout an application or group of
       applications.
    </p>
      <p>
        To redistribute Berkeley DB software, you must have a license for
        the Berkeley DB product you use.  For further details, refer to the
        licensing informaion at:  
        <a class="ulink" href="http://www.oracle.com/technetwork/database/berkeleydb/downloads/index.html" target="_top">http://www.oracle.com/technetwork/database/berkeleydb/downloads/index.html</a>
    </p>
      <p>
        A comparison of the four Berkeley DB product features is provided
        in the following table.
    </p>
      <div class="informaltable">
        <table border="1" width="80%">
          <colgroup>
            <col align="left" />
            <col align="left" />
            <col align="left" />
            <col align="left" />
            <col align="left" />
          </colgroup>
          <thead>
            <tr>
              <th align="center"> </th>
              <th align="center">Berkeley DB Data Store</th>
              <th align="center">Berkeley DB Concurrent Data Store</th>
              <th align="center">Berkeley DB Transactional Data Store</th>
              <th align="center">Berkeley DB High Availability</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td align="left">
                        <p>
                            What is this product?
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Provides indexed, single-reader/single-writer embedded data storage
                        </p>
                    </td>
              <td align="left">
                        <p>
                           Adds simple locking with multiple-reader/single-writer capabilities
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Adds complete ACID transaction support, as well as recovery
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Adds single-master data replication across multiple physical machines
                        </p>
                    </td>
            </tr>
            <tr>
              <td align="left">
                        <p>
                            Ensures recovery operation
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
            </tr>
            <tr>
              <td align="left">
                        <p>
                            Provides Locking feature
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
            </tr>
            <tr>
              <td align="left">
                        <p>
                            Provides concurrent read-write access
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
            </tr>
            <tr>
              <td align="left">
                        <p>
                            Provides transactional support
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
            </tr>
            <tr>
              <td align="left">
                        <p>
                            Supports SQL access
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
            </tr>
            <tr>
              <td align="left">
                        <p>
                            Provides replication support
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            No
                        </p>
                    </td>
              <td align="left">
                        <p>
                            Yes
                        </p>
                    </td>
            </tr>
          </tbody>
        </table>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp50715960"></a>Berkeley DB Data Store</h3>
            </div>
          </div>
        </div>
        <p>The Berkeley DB Data Store product is an embeddable, high-performance data store.  This product
	supports multiple concurrent threads of control, including multiple
	processes and multiple threads of control within a process.  
	However, Berkeley DB Data Store does not support locking,
	and hence does not guarantee correct behavior if more than one
	thread of control is updating the database at a time.  The Berkeley DB Data Store is
	intended for use in read-only applications or applications which can
	guarantee no more than one thread of control updates the
	database at a time.</p>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp50715552"></a>Berkeley DB Concurrent Data Store</h3>
            </div>
          </div>
        </div>
        <p>The Berkeley DB Concurrent Data Store product adds multiple-reader, single writer capabilities to
	the Berkeley DB Data Store product. This product provides built-in concurrency and locking feature. 
	Berkeley DB Concurrent Data Store is
	intended for applications that need support for concurrent updates to a
	database that is largely used for reading.</p>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp50708368"></a>Berkeley DB Transactional Data Store</h3>
            </div>
          </div>
        </div>
        <p>The Berkeley DB Transactional Data Store product adds support for transactions and database recovery. 
	Berkeley DB Transactional Data Store is intended for applications that require
	industrial-strength database services, including excellent performance
	under high-concurrency workloads of read and write operations,
	the ability to commit or roll back multiple changes to the database at
	a single instant, and the guarantee that in the event of a
	catastrophic system or hardware failure, all committed database changes
	are preserved.</p>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp50712672"></a>Berkeley DB High Availability</h3>
            </div>
          </div>
        </div>
        <p>The Berkeley DB High Availability product adds support for data replication. A single master system
	handles all updates, and distributes these updates to multiple replicas. The number of replicas depends on the application requirements. All replicas can handle read requests during
	normal processing. If the master system fails for any reason, one of
	the replicas takes over as the new master system, and distributes
	updates to the remaining replicas.</p>
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		Access Method Configuration
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